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At present, advanced computer networks, especially remote computer networks, are generally divided into communication subnets for data communication and user resource subnets for computer system interconnection. It includes devices such as transmission lines, hubs, and network management centers. The integrated wiring system is the basis of the information network, which determines the performance of a security monitoring system.
The monitoring system wiring design involves video monitoring lines, broadcast intercom lines, alarm lines, sound monitoring lines, and network lines. There are many media used to transmit image signals. According to the Minjiang Cable, there are mainly coaxial cables, twisted pairs and optical fibers. At present, the three transmission media under the monitoring system are different, and each has its own advantages and disadvantages. Today, the Lanjiang cable will give you a detailed introduction!
Coaxial cable is the most traditional video transmission method, its anti-interference ability is not strong, only suitable for video transmission distance of several hundred meters. However, the relative cost is low, so it is suitable for analog camera monitoring in small factories or schools.
Compared with the coaxial cable twisted pair transmission distance is much larger, the maximum can reach 2400 meters, its price is cheap and easy to access, anti-interference ability is also good, PoE power supply can also reduce the amount of integrated wiring tasks. However, the twisted pair material has a weak anti-aging ability and can only transmit one image at a time. Therefore, it is more suitable for video surveillance of network cameras in medium and short distances, where the camera points are relatively scattered, or where the points are relatively close but relatively concentrated, such as banks, hotel chains, supermarkets or university campuses.
The advantages of optical fiber transmission are: long transmission distance, high speed, large bandwidth, low attenuation, and best anti-interference performance, suitable for long-distance and large-scale video transmission, such as road intersection monitoring. The farthest can even reach tens of hundreds of kilometers, it is transmitted in the fiber by converting video and control signals into optical signals. The optical fiber transmission equipment is mainly used for video optical transceivers and optical transceivers. The video optical transceivers are mainly used for signal transmission of analog cameras. The signal loss is small, the noise and distortion are small, and the transmission quality is high, which is suitable for long-distance transmission. The optical transceiver is suitable for signal transmission of the network camera, and it also has the advantages of long transmission distance, low loss and strong anti-interference ability of the video optical transceiver. With fiber-optic switches, PoE technology can also be used to power front-end cameras, reducing the amount of integrated wiring. Therefore, fiber is the best way to solve long-distance transmission.
In terms of wiring, wired network transmission is the same as analog camera wiring. In the selection of the data line, the network surveillance camera selects an ordinary network cable transmission. In the world of the Internet, there are actually many types of "network cables". The surveillance cameras use twisted pairs and coaxial cables.
The development of communication technology is very rapid, and it is necessary to use a strong communication system as the core of informationization and intelligence. High-speed unshielded twisted pair and fiber optic technology are introduced into wide-area and local communication networks, including local user circuits and office buildings, enabling high-speed and large-capacity personal communication and office communications. To meet the current needs and consider the long-term needs in the future, propose appropriate goals, and finally use intelligent wiring to improve the flexibility, comprehensiveness and openness of the system to meet every change in the new era.